Hydraulic loader



April 8, 1958 J. KALAUS HYDRAULIC LOADER 2 Sheets-Sheet 1 Filed June 14, 1955 John Ka/aus I INVENTOR.

' by d pri 8, 1958 J. KALAUS 2,829,787

HYDRAULIC LOADER Fi led June 14, 1955 2 Sheets-Sheet 2 John Ka/aus INVENTOR.

7 2,829,787 HYDRAULIC LOADER John Kalaus, St; Paul, Minn. Application June 14, 1955, Serial No. 515,311 2 Claims; (ci.214-132 This invention relates in general to new and useful improvements in attachments for tractors, and more specifically to a hydraulic loader attachment for tractors.

The primary object of this invention is to provide an improved loader attachment for tractors which is selfcontained and which is constructed whereby it may be conveniently mounted on the front of a tractor with minor alterations-of the tractor and which may be operated through the use of the hydraulic system of such tractor.

7 Another object of this. invention is'to provide an improved hydraulic motor which includes a boom swingable to desired positions, the boom having carried thereby a lifting head which is rotatable for dumping purposes.

Another object of this invention is to provide an improved hydraulic loader wherein all operations of such loader is controlled hydraulically and may be so done by the operator of atractor to which the hydraulic loader is attached while seated on the operators seat of such tractor.

A further object of this invention is to provide an improved hydraulic loader which incorporates a mounting frame securable to the front portion of a tractor, the mounting frame having pivotally connected thereto a forward boom, the boom being provided withsuitable means for swinging it both horizontally and vertically as desired, a shaft extending through the boom and having mounted thereon for rotation therewith a lifting head, there being provided means for selectively rotating the lift head to dump the same.

These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as' more fully hereinafter described and claimed, reference being had to the accompanyingdrawings forming a part hereof, wherein like numerals refer to like parts throughout, and inwhich:

Figure l is a perspective view of the hydraulic loader which is the subject of this invention and shows the general details thereof; Figure 2 is a perspective view of the mounting frame of the hydraulic loader and shows the specific details thereof;

Figure 3 is the fluid diagram showing the controls for the various components of the hydraulic loader;

Figure 4 is a side elevational view on a reduced scale of the hydraulic loader, of Figure land shows the same attached to the forward part of a conventional tractor, portions of the hydraulic loader being brokenaway and shown in-se'ctionin order to clearly illustrate the details of other elements thereof; and

Figure 5 is a transverse generally vertical sectional view taken substantially upon the plane indicated by the section line 5-5 of Figure 4 and shows the relationship of the various control means of the hydraulic loader.

Referring now to the drawings in detail, it will be seen that there is best illustrated in Figures 1 and 2, the hydraulic loader, which is the subject of this invention, the

2,829,787 Patented Apr. 1958 ice hydraulic loader being referred to in general by the reference numeral 10. The hydraulic loader 10 includes a mounting frame which is referred to in general by the reference numeral 12. The mounting frame 12 is generally rectangular in elevation and includes a lower frame member 14, upstanding side frame members 16, and a top frame member 29. All the frame members 20 are formed of angle members, as is best illustrated in Figure 2.

Secured to the underside of the lower frame member 14 and extending rearwardly therefrom is a pair of angle mounting rails 22. The function of the mounting rails will be set forth in more detail hereinafter. Also, there is secured to the central part of the underside of a lower frame rails 14 a strap 24. The strap 24 includes a recess portion 26 and a removable section 28 which is secured in place by suitable fasteners 30.

Disposed at opposite ends of the lower frame member 14 are blocks 32. Mounted within the general confines of the lower frame member 14 adjacent the center thereof are blocks 34. Extending through the blocks 32 and 34 is an elongated rod 36. Mounted on the rod 36 for pivotal movement with respect thereto, the rod 36 being journalled in the blocks 32 and 34 for rotation, is a rear section 38 of a support bracket which is referred to in general by the reference numeral 40. Also secured to the rod 36 adjacent one of the blocks 32 is a rear section 42 of a bracket which is referred to in general by the reference. numeral 44.

The support bracket 40 also includes a forward section 46 which is hinged to the rear section 38 by a vertical pivot pin 48; The forward end of the forward section 4-6 underlies and isrigidly secured to an elongated tubular boom 50. Thus from the foregoing it will be readily apparent that the boom 54 is mounted for both vertical and horizontal swinging movement.

Carried by the underportion of the upper frame member 20 adjacent the center thereof is a pair of spaced blocks 52. The blocks 52 have extending therebetween a rod 54 on which there is mounted a rear section 56 of a bracket, which is referred to in general by the reference numeral 58. The rod 54 is suitably journalled in the blocks 52 to permit pivoting of the rear section 56.

The bracket 58 also includes a forward section 66 which is connected to the rear section 56 by a pivot pin 62. The forward section 60 is secured to the rear end of a cylinder 64 of an extensible hydraulic motor which is referred to in general by the reference numeral 66. The hydraulic motor 66 is of the conventional type and includes a piston (not shown) which has connected an extensible piston rod 63. The piston rod 68 extends out of the forward end of the cylinder and is pivotally connected by means of a piston pin '70 by means of a bifurcated bracket 72 mounted on the upper forward part of the boom 50. By extending or contracting the extensible fluid motor 66, the boom 59 may be selectively pivoted in a vertical plane and retained in a desired position.

The bracket 44 includes a forward section 76 which is connected to the rear section 42 by a vertical pivot pin '78. The forward section '76 is secured to the rear end of a cylinder 86 of the extensible hydraulic motor 82. The extensible hydraulic motor 82 is similar to the hydraulic motor 66 and includes an extensible piston rod 84. The piston rod 84 has the forward end thereof connected by a pivot pin 86 to'a bifurcated bracket 33 secured to the forward portion of the boom 59 at one side thereof. The extensible hydraulic motor 82 may be utilized for swinging the boom St) in a generally horizontal plane.

Mounted at the forward end of the boom 50 and the lifting head which is referred to in general by the reference numeral 90. The lifting head 90 may be of any type and is illustrated as a bucket 92 having forwardly extending tines 94. Secured to the rear of the lifting head 90 is a shaft 96 which is suitably journalled within the boom 50, as is best illustrated in Figures 4 and 5. The shaft 96 extends the full length of the boom 50 and projects out of the rear end thereof. 'Mounted on the rear end of the shaft 96 is a crank arm 98.

Secured to the rear portion of the boom 50 is a trans-. versely extending support arm 100. Secured to the support arm 100 by a pin 102 is an intermediate portion of a cylinder 104. The cylinder 104 is a part of an extensible hydraulic motor 106 which also includes an extensiblepiston rod 108. The piston rod 108 is disposed transversely of the boom 50 and is provided at its end remote from the cylinder 104 with a bifurcated fitting 110 which is pivotally connected to the upper end of the crank 98 by pivot pin 112.

From the foregoing description of the mounting of the shaft 96 and crank arm 98 and the components of the extensible hydraulic cylinder 106, it will be readily apparent that the hydraulic cylinder 106 may be utilized for selectively positioning the lifting head 90. Through the use of the hydraulic cylinder 106 the lifting head 90 may be rotated to a dumping position as desired.

Referring now to Figure 4 in particular, it will be seen that there is illustrated the hydraulic loader mounted on a conventional type of tractor which is referred to in general by the reference numeral 114. Among other features, the tractor 114 includes a frame 116. The tractor 114 also includes a front wheel assembly 118 including a front axle housing 120. The mounting frame 12 is mounted on the tractor 114 by securing the mounting rails 22 to opposite sides of the frame 116. The strap 24 is secured to the front axle housing 120.

The tractor 114 will include a hydraulic system having a reservoir 122 which is connected to a hydraulic pump 124 by a line 126. Connected to the pump 124 by line 128 is a pressure manifold 130. Connected to the reservoir is a return manifold 132.

The operation of the hydraulic motor 66 is controlled by a conventional four-way valve 134. The four-way valve 134 is connected at the opposite end of the cylinder 64 by means of lines 136 and 138. The valve 134 is also connected to the manifold 130 by a line 140 and to the manifold 132 by a line 142.

A similar valve 144 is utilized for controlling the operation of the hydraulic motor 82. The cylinder 80 is connected to the valve 144 by lines 146 and 148 which are connected to opposite ends of the cylinder 80. The valve 144 is connected to the manifold 130 by a line 150 and to the manifold 132 by a line 152.

A valve 154 is utilized for controlling the operation of the hydraulic motor 106. The cylinder 104 has the opposite ends thereof connected to the valve 154 by lines 156 and 158. The valve 154 is connected to the manifold 130 by a line 160 to the manifold 132 by a line 162.

From the foregoing description of the hydraulic system for the hydraulic loader, it will be readily apparent that by manipulating the valves 134, 144 and 154, the various hydraulic motors 66, 82 and 106, respectively, may be extended or contracted as desired to either swing the boom 50 or to rotate the lifting head 90. It is to be readily understood that the valves 134, 144 and 154 may be mounted in a suitable position on the tractor 114 by operation by the operator thereof.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

1. A loader attachment for tractors comprising a mounting frame, means connected to said mounting frame for mounting said mounting frame on a forward part of a tractor, a transverse pin carried bya lower part of said mounting frame, a support bracket, said support bracket including a first section carried by said transverse pin for pivoting in a generally vertical plane, a second section, a vertical pivot pin connecting said second section to said first section for swinging both in a vertical plane with said first section and in a transverse direction about said vertical pivot pin independently of said first section, an elongated boom, one end of said boom being connected to said second support bracket section, means extending between said boom and said mounting frame for controlling vertical swinging of saidboom and for selectively vertically positioning said boom, and other means carried by said transverse pin and connected to said boom for controlling transverse swinging of said boom and transversely positioning said boom, a lifting head carried by said boom remote from said mounting frame, means connecting said lifting head to said boom for rotation about an axis generally parallel to the axis of said boom, and means connected to said lifting head for selectively positioning said lifting head.

2'. A loader attachment for tractors comprising a mounting frame, mounting means on said mounting frame for mounting said mounting frame on a forward portion of a tractor, said mounting frame including a lower portion, a vertical intermediate portion and an upper portion, a transverse pin carried by said lower portion, a support bracket, said support bracket including first and second sections pivotally connected together by a vertical pivot pin whereby said second support bracket section may pivot independently of said first support bracket section, said first support bracket section being carried by said transverse pin for pivotal movement in a generally vertical plane, a boom, means securing said boom, to said second support bracket section for pivotal movement about both of said transverse pin and said vertical pivot pin to permit both vertical swinging and transverse swinging of said boom, a first hydraulic motor extending between said upper portion and a forward part of said boom for vertically positioning said boom, a second hydraulic motor having one end connected to said transverse pin and the opposite end secured to the intermediate portion of said boom for swinging said boom in a transverse direction, said boom being tubular, a shaft journaled in said boom and extending therethrough, a lifting head secured to a forward end of said shaft, a crank arm secured to a rear end of said shaft, a third hydraulic motor carried by a rear part of said boom adjacent said intermediate portion of said mounting frame, said third hydraulic motor being connected to said crank arm for rotating said shaft to a selected position in said lifting head relative to said boom.

References Cited in the file of this patent UNITED STATES PATENTS 1,362,566 Fulton et al Dec. 14, 1920 1,805,818 Frisbie May 19, 1931 1,987,982 Wheeler Jan. 15, 1935 ,674,385 Stauth et al. Apr. 6, 1954 8, 99 Pilch Oct. 30, 1956 

